Buying dress shirts for men starts with two measurements: your neck, taken just below the Adam's apple, and your sleeve, from the center back of your neck to your wrist bone. Then choose a fit. Slim fit sits close under a jacket, modern fit sits between slim and classic, and classic fit gives the most room through the chest and waist. From there, filter by color, collar, cuff and fabric, or find a Men's Wearhouse store near you to be measured.For more, read the Frequently Asked Questions below.